Shape 5 is the same traditional kidney-shape as Shapes 0 & 1, only bigger. It offers more surface coverage, making it great for smoothing a slab of clay.
All of our polymer ribs are made of unique flexible materials that are resistant to wear and the formation of burrs. We've found that with general use these ribs become burnished over time. Each polymer rib shape is available in variations of flexibility.
Blue - Firm